Because the Jade Emperor did not want to kill him, mainly to give the Queen Mother face, he had to punish Monk Sha. Everyone has heard that the Queen Mother and the Jade Emperor are not actually a couple, but the Queen Mother has a more respected status, so her peach feast is held in the Heavenly Palace. It is said that what Monk Sha actually broke was not a glass cup but a glass cup. These glass cup were used for the peach feast. Breaking the glass cup was equivalent to hitting the Queen Mother in the face, so the Jade Emperor was giving the Queen Mother face.
Everyone knows that the Barefoot Immortal is only a loose immortal, and he is considered a third-rate loose immortal. He usually travels around the world, so he meets more people. It is said that the Barefoot Immortal interceded with Sha Monk in order to sell Sha Monk a favor to his master. In addition, the Jade Emperor did not want to kill him, so the Barefoot Immortal begged him to accept the favor. In the end, Sha Monk escaped death and was demoted to the Liusha River, where he suffered heart-piercing pain every seven days. Finally, thanks to the enlightenment of Guanyin Bodhisattva, I waited for Tang Monk to pass by the Liusha River, and followed Tang Monk to go to the West to collect scriptures, waiting for the Japanese official to resume his duties.
You must know that Sha Monk is the personal bodyguard of the Jade Emperor. Sha Monk once said that he is the greatest at the Nantianmen, and he is also the Jade Emperor's follower at the Lingxiao Palace. The Jade Emperor was able to appoint Sha Seng as his personal bodyguard, which shows that he trusted him very much. In Journey to the West, Sand Monk mentions flat peaches twice and glass lamp once. It can be seen that this matter is indeed related to the Queen Mother. Some people say that the flat peach given to Sha Monk by the Queen Mother during the peach feast was too small, so he broke the glass cup in anger. I don’t think this is true. Sha Seng was a small official, and he didn't dare to ask for a big flat peach, so there was something fishy about Sha Seng breaking the glass lamp.
Drifting monk seems to be a relatively honest person at first glance. When he followed Monk Tang to learn Buddhist scriptures from the West, he showed that he did not earn or rob. There is no need for Sha Seng to offend the Queen Mother for the peach. Sha Seng’s identity has always been a mystery in the novel. Maybe Sha Seng's demotion was related to his identity, or maybe it was really related to the Queen Mother. Since the Barefoot Immortal could beg for mercy, it shows that the Jade Emperor did not really want to kill him.